Pion transverse charge density and the edge of hadrons

Journal Article · Fri Aug 01 00:00:00 EDT 2014 · Phys.Rev.C

DOI:https://doi.org/10.1103/PhysRevC.90.025211· OSTI ID:1151419

Carmignotto, Marco ^[1]; Horn, Tanja ^[1]; Miller, Gerald A. ^[2]

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1. Catholic University of America
2. University of Washington

We use the world data on the pion form factor for space-like kinematics and a technique used to extract the proton transverse densities, to extract the transverse pion charge density and its uncertainty due to experimental uncertainties and incomplete knowledge of the pion form factor at large values of Q2. The pion charge density at small values of b<0.1 fm is dominated by this incompleteness error while the range between 0.1-0.3 fm is relatively well constrained. A comparison of pion and proton charge densities shows that the pion is denser than the proton for values of b<0.2 fm. The pion and proton distributions seem to be the same for values of b=0.2-0.6 fm. Future data from Jlab 12 GeV and the EIC will increase the dynamic extent of the data to higher values of Q2 and thus reduce the uncertainties in the extracted pion charge density.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1151419
• Report Number(s): JLAB-THY-14-1932; DOE/OR/23177-3168; arXiv:1404.1539; NSF grants PHY-1019521, PHY-1306227, and USDOE Grant no. DE-FG02-97ER-41014
• Journal Information: Phys.Rev.C, Vol. 90, Issue 02; ISSN 0556--2813
• Country of Publication: United States
• Language: English